Perhaps you should try some spelling variations:
"luong java java snippets" » "luong va java snippets", "luong java java slippers"
"dung thuc hanh snippets" » "dung thuoc hanh snippets", "duong thuc hanh snippets", "dung thu hanh snippets", "dung thuc thanh snippets", "dung thuc anh snippets", "dung thuc hinh snippets", "dung thuc hanh slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung thuc hanh snippets") or ("luong java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung thuc hanh snippets") OR ("luong java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung thuc hanh snippets ) or ( luong java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung thuc hanh snippets") or ("luong java java snippets"))) or ("locating bug code snippets"))*.